#pragma once
#include<vector>

namespace wjc
{

	template <class T,class Container =vector<T>>
	class Priority_queue
	{
	public:

		void adjust_up(int child)
		{
			int parent = (child-1) / 2;
			while (child > 0)
			{
				if (_con[child > _con[parent]])
				{
					swap(_con[child], _con[parent]);
					child = parent;
					parent = (child - 1) / 2;
				}
				else
				{
					break;
				}
			}
		}

		void adjust_down(int parent)
		{
			int child = parent * 2 + 1;
			while (child<_con.size())
			{
				if (child + 1 < _con.size() && _con[child] < _con[child + 1])
				{
					++child;
				}
				if (_con[child] > _con[parent])
				{
					swap(_con[child], _con[parent]);
					parent = child;
					child = parent * 2 + 1;
				}
				else
				{
					break;
				}
			}
		}
		void push(const T& x)
		{
			_con.push_back(x);
			adjust_up(_con.size()-1);
		}
		void pop()
		{
			swap(_con[0], _con[_con.size() - 1]);
			_con.pop_back();
			adjust_down(0);
		}
		const T& top()
		{
			return _con[0];
		}

		size_t size()
		{
			return _con.size();
		}


		bool empty()
		{
			return _con.empty();
		}


	private:
		Container _con;
	};




	void test1()
	{
		Priority_queue<int> d1;
		d1.push(1);
		d1.push(2);
		d1.push(3);
		d1.push(4);
		d1.push(5);
		while (!d1.empty())
		{
			cout << d1.top() << " ";
			d1.pop();
		}

	}


}